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src/share/vm/gc/shared/workerManager.hpp

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rev 11508 : 8157240: GC task trace logging is incomprehensible
Reviewed-by: tschatzl
rev 11509 : imported patch code_review2


  41   //   initializing - true if this is called to get the initial number of
  42   // GC workers.
  43   // If initializing is true, do a vm exit if the workers cannot be created.
  44   // The initializing = true case is for JVM start up and failing to
  45   // create all the worker at start should considered a problem so exit.
  46   // If initializing = false, there are already some number of worker
  47   // threads and a failure would not be optimal but should not be fatal.
  48   template <class WorkerType>
  49   static uint add_workers (WorkerType* holder,
  50                    uint active_workers,
  51                    uint total_workers,
  52                    uint created_workers,
  53                    os::ThreadType worker_type,
  54                    bool initializing) {
  55     uint start = created_workers;
  56     uint end = MIN2(active_workers, total_workers);
  57     for (uint worker_id = start; worker_id < end; worker_id += 1) {
  58       WorkerThread* new_worker = holder->install_worker(worker_id);
  59       assert(new_worker != NULL, "Failed to allocate GangWorker");
  60       if (new_worker == NULL || !os::create_thread(new_worker, worker_type)) {
  61         if(initializing) {
  62           vm_exit_out_of_memory(0, OOM_MALLOC_ERROR,
  63                   "Cannot create worker GC thread. Out of system resources.");
  64         }
  65       }
  66       created_workers++;
  67       os::start_thread(new_worker);
  68     }
  69 
  70     log_trace(gc, task)("AdaptiveSizePolicy::add_workers() : "
  71        "active_workers: %u created_workers: %u",
  72        active_workers, created_workers);
  73 
  74     return created_workers;














  75   }
  76 };
  77 #endif // SHARE_VM_GC_SHARED_WORKERMANAGER_HPP


  41   //   initializing - true if this is called to get the initial number of
  42   // GC workers.
  43   // If initializing is true, do a vm exit if the workers cannot be created.
  44   // The initializing = true case is for JVM start up and failing to
  45   // create all the worker at start should considered a problem so exit.
  46   // If initializing = false, there are already some number of worker
  47   // threads and a failure would not be optimal but should not be fatal.
  48   template <class WorkerType>
  49   static uint add_workers (WorkerType* holder,
  50                            uint active_workers,
  51                            uint total_workers,
  52                            uint created_workers,
  53                            os::ThreadType worker_type,
  54                            bool initializing) {
  55     uint start = created_workers;
  56     uint end = MIN2(active_workers, total_workers);
  57     for (uint worker_id = start; worker_id < end; worker_id += 1) {
  58       WorkerThread* new_worker = holder->install_worker(worker_id);
  59       assert(new_worker != NULL, "Failed to allocate GangWorker");
  60       if (new_worker == NULL || !os::create_thread(new_worker, worker_type)) {
  61         if (initializing) {
  62           vm_exit_out_of_memory(0, OOM_MALLOC_ERROR,
  63                   "Cannot create worker GC thread. Out of system resources.");
  64         }
  65       }
  66       created_workers++;
  67       os::start_thread(new_worker);
  68     }
  69 




  70     return created_workers;
  71   }
  72 
  73   // Log (at trace level) a change in the number of created workers.
  74   template <class WorkerType>
  75   static void log_worker_creation(WorkerType* holder,
  76                                   uint previous_created_workers,
  77                                   uint active_workers,
  78                                   uint created_workers,
  79                                   bool initializing) {
  80     if (previous_created_workers < created_workers) {
  81       const char* initializing_msg =  initializing ? "Adding initial" : "Creating additional";
  82       log_trace(gc, task)("%s %s(s) previously created workers %u active workers %u total created workers %u",
  83                           initializing_msg, holder->group_name(), previous_created_workers, active_workers, created_workers);
  84     }
  85   }
  86 };
  87 #endif // SHARE_VM_GC_SHARED_WORKERMANAGER_HPP
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